document.write( "Question 747813: 1) John, twelve years old, is three times as old as his brother. How old will John be when he is as old as his brother?\r
\n" ); document.write( "\n" ); document.write( "2)Mary was both 13th highest and 13th lowest in a spelling contest. How many people were in the contest?\r
\n" ); document.write( "\n" ); document.write( "3)Tunde's mother sent him to the store to get 9 large cans of peaches. Tunde could only carry 2 cans at a time. How many trips to the store did Tunde have to make?\r
\n" ); document.write( "\n" ); document.write( "4) The price of a puzzle was cut 20% for a trade fair event. By what percentage must the puzzle item be increased to again sell it at the original price?\r
\n" ); document.write( "\n" ); document.write( "5)If when the selling price is doubled, the profit triples, what is the profit percent?\r
\n" ); document.write( "\n" ); document.write( "6)A vendor bought puzzles at 6 for a 1 naira. How many for a Naira must he sell to gain 20%? \n" ); document.write( "

Algebra.Com's Answer #455185 by Edwin McCravy(20056) $\"\"$ $\"About$

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1) John, twelve years old, is three times as old as his brother. How old will John be when he is as old as his brother?
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document.write( "That's a silly question.  His brother is younger, only 4 years old.  So John\r\n" );
document.write( " will never be 4 years old if he's already 12.

\n" ); document.write( "2)Mary was both 13th highest and 13th lowest in a spelling contest. How many people were in the contest?
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document.write( "There were 12 above her and 12 below her.  That's 24 in the contest other than\r\n" );
document.write( "Mary.  So Mary makes it 25.\r\n" );
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\n" ); document.write( "Tunde's mother sent him to the store to get 9 large cans of peaches. Tunde could only carry 2 cans at a time. How many trips to the store did Tunde have to make?
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document.write( "He went to the store 5 times.\r\n" );
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document.write( "He went the first time and brought home cans #1 and #2\r\n" );
document.write( "He went a second time and brought home cans #3 and #4\r\n" );
document.write( "He went a third time and brought home cans #5 and #6\r\n" );
document.write( "He went a fourth time and brought home cans #7 and #8\r\n" );
document.write( "He went a fifth time and brought home can #9.   \r\n" );
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\n" ); document.write( "4) The price of a puzzle was cut 20% for a trade fair event. By what percentage must the puzzle item be increased to again sell it at the original price?
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document.write( "It doesn't matter what it cost.  Suppose it originally cost $100.  Then it was\r\n" );
document.write( "cut 20% down to $80\r\n" );
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document.write( "$80 +  = $100\r\n" );
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document.write( "80 + 80x = 100\r\n" );
document.write( "     80x = 20\r\n" );
document.write( "       x =  = , changed to percent, 25%\r\n" );
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\n" ); document.write( "5)If when the selling price is doubled, the profit triples, what is the profit
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document.write( "Profit percent is 100%\r\n" );
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document.write( " (Selling price) - (Cost) =  (Profit)\r\n" );
document.write( "2(Selling price) - (Cost) = 3(Profit)     \r\n" );
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document.write( " S - C = P\r\n" );
document.write( "2S - C = 3P\r\n" );
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document.write( "Multiply the first equation through by -2 to eliminate S\r\n" );
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document.write( "-2S + 2C = -2P\r\n" );
document.write( " 2S -  C =  3P\r\n" );
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document.write( "       C = P\r\n" );
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document.write( "Divide both sides by C\r\n" );
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document.write( "       1 = \r\n" );
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document.write( "So Profit percent is 100% = 1·100% = 100%\r\n" );
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document.write( "Edwin

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